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The large Surinamese migrant population in the Netherlands is a major risk group for urogenital  Chlamydia trachomatis  infection. Suriname, a former Dutch colony, also has a high prevalence of  C. trachomatis . Surinamese migrants travel extensively between the Netherlands and Suriname. Our objective was to assess whether the Surinamese migrants in the Netherlands form a bridge population facilitating transmission of  C. trachomatis  between Suriname and the Netherlands. If so, joint prevention campaigns involving both countries might be required.   Between March 2008 and July 2010, participants were recruited at clinics in Paramaribo, Suriname and in Amsterdam, the Netherlands. Participants were grouped as native Surinamese, native Dutch, Surinamese migrant, Dutch migrant, or Other, based on country of residence and country of birth of the participant and of their parents. Risk behavior, such as sexual mixing between ethnic groups, was recorded and  C. trachomatis  positive samples were typed through multilocus sequence typing (MLST). A minimum spanning tree of samples from 426 participants showed four MLST clusters. The MLST strain distribution of Surinamese migrants differed significantly from both the native Surinamese and Dutch populations, but was not an intermediate state between these two populations. Sexual mixing between the Surinamese migrants and the Dutch and Surinamese natives occurred frequently. Yet, the MLST cluster distribution did not differ significantly between participants who mixed and those who did not.  Sexual mixing occurred between Surinamese migrants in Amsterdam and the native populations of Suriname and the Netherlands. These migrants, however, did not seem to form an effective bridge population for  C. trachomatis  transmission between the native populations. Although our data do not seem to justify the need for joint campaigns to reduce the transmission of  C. trachomatis  strains between both countries, intensified preventive campaigns to decrease the  C. trachomatis  burden are required, both in Suriname and in the Netherlands.

The Role of Surinamese Migrants in the Transmission of Chlamydia trachomatis between Paramaribo, Suriname and Amsterdam, The Netherlands